I found a mobile phone in the hotel. Is it theft? The owner looked for me, but there was no conclusive evidence. I lost my mobile phone again. What should I do?

This obviously does not count! Even according to the current laws of the country, you are not a thief! You can directly tell the owner that you did find the mobile phone, but you didn't use it or sell it, just lost it, depending on the other party's answer. If the other party insists that you stole it, you can go to the public security bureau for the record and apply for monitoring when. The hotel will be monitored.